Control of two reflux streams in a fractional separation system

ABSTRACT

DETERMINE THE REQUIRED EXTERNAL REFLUX FLOW RATE. THE FLOW RATE OF ONE OF THE LIQUID STREAMS IS MANIPOLATED RESPONSIVE TO A DESIRED CONTROL CRITERIA WHILE THE FLOW RATE OF THE OTHER LIQUID STREAM IS MANIPULATED TO PROVIDE THE BALANCE OF THE EXTERNAL REFLUX.   IN A FRACTIONAL DISTILLATION SYSTEM HAVING TWO SOURCES OF LIQUID REFLUX STREAMS WHICH WILL PARTIALLY VAPORIZE WHEN COMBINED FOR SUCH USE, THE FLOW RATE AND TEMPERATURE OF EACH OF THE LIQUID REFLUX STREAMS ARE MEASURED AND SIGNALS REPRESENTATIVE THEREOF ARE APPLIED TO A COMPUTER-COMTROLLER. THE SIGNALS ARE COMBINED TO ESTABLISH A SIGNAL REPRESENTATIVE OF THE PREFLASH TEMPERATURE OF THE COMBINED STREAM, WHICH IS THEN EMPLOYED IN AN INTERNAL REFLUX CONTROL TO



